Computer Codes
427 OBD-II diagnostic trouble codes in this category.
Showing page 1 of 5 (427 codes total)
| Code | Description | Subsystem | Severity |
|---|---|---|---|
| P01E3 | Engine Coolant Temperature Sensor 3 Circuit | Powertrain Control | Medium |
| P01E4 | Engine Coolant Temperature Sensor 3 Circuit Range/Performance | Powertrain Control | Medium |
| P01E5 | Engine Coolant Temperature Sensor 3 Circuit Low | Powertrain Control | Medium |
| P01E6 | Engine Coolant Temperature Sensor 3 Circuit High | Powertrain Control | Medium |
| P01E7 | Engine Coolant Temperature Sensor 3 Circuit Intermittent/Erratic | Powertrain Control | Medium |
| P01E8 | Engine Coolant Heater A Control Circuit/Open | Powertrain Control | Medium |
| P01E9 | Engine Coolant Heater A Control Circuit Low | Powertrain Control | Medium |
| P03E4 | Cylinder 8 Combustion Performance | Powertrain Control | Medium |
| P03E5 | A Camshaft Position Actuator Position Sensor C Circuit Bank 1 | Powertrain Control | Medium |
| P03E6 | A Camshaft Position Actuator Position Sensor C Range/Performance Bank 1 | Powertrain Control | Medium |
| P03E7 | A Camshaft Position Actuator Position Sensor C Circuit Low Bank 1 | Powertrain Control | Medium |
| P03E8 | A Camshaft Position Actuator Position Sensor C Circuit High Bank 1 | Powertrain Control | Medium |
| P03E9 | A Camshaft Profile Actuator Position Sensor A Exceeded Learning Limit | Powertrain Control | Medium |
| P04E3 | Crankcase Ventilation Hose Connection Sensor Circuit High | Powertrain Control | Medium |
| P04E4 | Crankcase Ventilation Hose Connection Sensor Circuit Intermittent/Erratic | Powertrain Control | Medium |
| P04E5 | EGR Temperature Sensor D Circuit | Powertrain Control | Medium |
| P04E6 | EGR Temperature Sensor D Circuit Range/Performance | Powertrain Control | Medium |
| P04E7 | EGR Temperature Sensor D Circuit Low | Powertrain Control | Medium |
| P04E8 | EGR Temperature Sensor D Circuit High | Powertrain Control | Medium |
| P04E9 | EGR Temperature Sensor D Circuit Intermittent/Erratic | Powertrain Control | Medium |
| P0512 | Starter Request Circuit | Starting System | High |
| P0513 | Incorrect Immobilizer Key | Immobilizer | High |
| P0514 | Battery Temperature Sensor Circuit Range/Performance | Charging System | Medium |
| P0515 | Battery Temperature Sensor Circuit | Charging System | Medium |
| P0516 | Battery Temperature Sensor Circuit Low | Charging System | Medium |
| P0517 | Battery Temperature Sensor Circuit High | Charging System | Medium |
| P0560 | System Voltage | Charging System | Medium |
| P0561 | System Voltage Unstable | Charging System | Medium |
| P05E3 | Park Brake Sensor/Switch Circuit | Powertrain Control | Medium |
| P05E4 | Park Brake Sensor/Switch Circuit Low | Powertrain Control | Medium |
| P05E5 | Park Brake Sensor/Switch Circuit High | Powertrain Control | Medium |
| P05E6 | Park Brake Sensor/Switch Circuit Range/Performance | Powertrain Control | Medium |
| P05E7 | Park Brake Sensor/Switch Circuit Intermittent/Erratic | Powertrain Control | Medium |
| P05E8 | Engine Oil Bypass Valve Control Circuit/Open | Powertrain Control | Medium |
| P05E9 | Engine Oil Bypass Valve Control Circuit Low | Powertrain Control | Medium |
| P0600 | Serial Communication Link Malfunction | ECM/PCM | High |
| P0601 | Internal Control Module Memory Check Sum Error | ECM/PCM | High |
| P0602 | Control Module Programming Error | ECM/PCM | High |
| P0603 | Internal Control Module KAM Error | ECM/PCM | Medium |
| P0604 | Internal Control Module RAM Error | ECM/PCM | High |
| P0605 | Internal Control Module ROM Error | ECM/PCM | High |
| P0606 | PCM/ECM Processor Fault | ECM/PCM | Critical |
| P0607 | Control Module Performance | ECM/PCM | High |
| P0608 | Control Module VSS Output A | ECM Output | Medium |
| P0609 | Control Module VSS Output B | ECM Output | Medium |
| P0610 | Control Module Vehicle Options Error | ECM Internal | Medium |
| P0611 | Fuel Injector Control Module Performance | Injector Driver | High |
| P0612 | Fuel Injector Control Module Relay Control | Injector Driver | High |
| P0613 | TCM Processor | TCM Internal | Critical |
| P0614 | ECM/TCM Incompatible | Module Compatibility | High |
| P0615 | Starter Motor Relay Circuit | Starting System | High |
| P0616 | Starter Motor Relay Circuit Low | Starting System | High |
| P0617 | Starter Motor Relay Circuit High | Starting System | Critical |
| P0618 | Alternative Fuel Control Module Performance | Alt Fuel System | Medium |
| P0619 | Alternative Fuel Control Module RAM/ROM Error | Alt Fuel System | High |
| P0620 | Generator Control Circuit | Charging System | High |
| P0621 | Generator Lamp L Control Circuit | Charging System | Medium |
| P0622 | Generator Field F Control Circuit | Charging System | High |
| P0623 | Generator Lamp Control Circuit | Charging System | Medium |
| P0624 | Fuel Cap Lamp Control Circuit | Warning Lamp | Low |
| P0625 | Generator Field Terminal Circuit Low | Charging System | High |
| P0626 | Generator Field Terminal Circuit High | Charging System | High |
| P0627 | Fuel Pump A Control Circuit/Open | Fuel Pump | High |
| P0630 | VIN Not Programmed or Incompatible | ECM Internal | High |
| P0631 | VIN Not Programmed or Incompatible TCM | TCM Internal | High |
| P0632 | Odometer Not Programmed | ECM Internal | Medium |
| P0633 | Immobilizer Key Not Programmed | Immobilizer | High |
| P0634 | PCM/ECM/TCM Internal Temperature Too High | ECM Internal | Critical |
| P0641 | Sensor Reference Voltage A Circuit/Open | Reference Voltage | High |
| P0642 | Sensor Reference Voltage A Circuit Low | Reference Voltage | High |
| P0643 | Sensor Reference Voltage A Circuit High | Reference Voltage | High |
| P0644 | Driver Display Serial Communication Circuit | Display Communication | Medium |
| P0645 | A/C Clutch Relay Control Circuit | A/C Control | Medium |
| P0646 | A/C Clutch Relay Control Circuit Low | A/C Control | Medium |
| P0647 | A/C Clutch Relay Control Circuit High | A/C Control | Medium |
| P0648 | Immobilizer Lamp Control Circuit | Immobilizer | Low |
| P0649 | Speed Control Lamp Control Circuit | Warning Lamp | Low |
| P0650 | Malfunction Indicator Lamp Control Circuit | Warning Lamp | Medium |
| P0651 | Sensor Reference Voltage B Circuit/Open | Reference Voltage | High |
| P0652 | Sensor Reference Voltage B Circuit Low | Reference Voltage | High |
| P0653 | Sensor Reference Voltage B Circuit High | Reference Voltage | High |
| P0654 | Engine RPM Output Circuit | ECM Output | Medium |
| P0655 | Engine Hot Lamp Output Control Circuit | Warning Lamp | Medium |
| P0656 | Fuel Level Output Circuit | ECM Output | Medium |
| P0657 | Actuator Supply Voltage A Circuit/Open | ECM Power Supply | High |
| P0658 | Actuator Supply Voltage A Circuit Low | ECM Power Supply | High |
| P0659 | Actuator Supply Voltage A Circuit High | ECM Power Supply | High |
| P0666 | Control Module Internal Temperature Sensor A Circuit | ECM/PCM | High |
| P0667 | Control Module Internal Temperature Sensor A Range/Performance | ECM/PCM | High |
| P0668 | Control Module Internal Temperature Sensor A Circuit Low | ECM/PCM | High |
| P0669 | Control Module Internal Temperature Sensor A Circuit High | ECM/PCM | High |
| P0670 | Glow Plug Control Module 1 Control Circuit/Open | ECM/PCM | High |
| P0671 | Cylinder 1 Glow Plug Circuit/Open | ECM/PCM | High |
| P0672 | Cylinder 2 Glow Plug Circuit/Open | ECM/PCM | High |
| P0673 | Cylinder 3 Glow Plug Circuit/Open | ECM/PCM | High |
| P0674 | Cylinder 4 Glow Plug Circuit/Open | ECM/PCM | High |
| P0675 | Cylinder 5 Glow Plug Circuit/Open | ECM/PCM | High |
| P0676 | Cylinder 6 Glow Plug Circuit/Open | ECM/PCM | High |
| P0677 | Cylinder 7 Glow Plug Circuit/Open | ECM/PCM | High |
| P0678 | Cylinder 8 Glow Plug Circuit/Open | ECM/PCM | High |
About Computer Codes
This page lists all 427 OBD-II diagnostic trouble codes classified under the Computer category. These codes are stored by your vehicle's onboard computer when a sensor detects a malfunction in the computer system. Each code begins with a letter indicating the system (P for Powertrain, B for Body, C for Chassis, U for Network) followed by four digits that identify the specific fault.
When your check engine light comes on, an OBD-II scanner reads these stored codes to help pinpoint the problem. Generic codes (where the second digit is 0) follow the SAE J2012 standard and mean the same thing on every vehicle. Manufacturer-specific codes (where the second digit is 1) may have different meanings depending on the vehicle brand.
Click any code in the table above to see its full description, possible causes, common symptoms, and step-by-step repair guidance. Use the search box to quickly find a specific code within this category.